I had a similar issue, I removed the bulb socket. got some sandpaper and lifted the tabs a bit and sanded both top and bottom. put it back and bingo these things were sooo bright. That what most members here have done I took the advise and it worked. try it.

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2006 BMW X5 (4.4i) N62

MY BMW X5... No matter how I disguise it... it's heritage keeps showing through!